Radiator for explosive engines



C. F. SPERY.

RADIATOR FOR EXPLOSIVE ENGINES.

APPLICATION FILED Nov. 7, 1919.

1A2,87& Emma June 27, 1922.

Ii Lillian-"W 1 j 1 11 Ill-HAW "Mum? 5 I f UNITED V STATES CHARLES F.SPERY, OF CHICAGO, ILLINOIS.

RADIATOR FOR EXPLOSIVE ENGINES.

Specification of Letters Patent. Patented June 27, 1922.

Application filed November 7, 1919. Serial No. 336,832.

which will enable others skilled in the art to which the said inventionappertains to make and use the same.

This invention has general "reference to improvements in radiators forinternal combustion engines; and it is especially addressed to the watertubes employed in these radiators. It consists, essentially, in thenovel and peculiar combination of parts and details of construction, ashereinafter first fully set forth and described, and then pointed out inthe claims.

The object of this invention is the production of an efiicient andserviceable core for radiators; and especially that type of radiators inwhich flat, straight, tu-bes surrounded by heat conducting fins areemployed. In this type of water tubes difiiculty is experienced inplacing separate fins upon the tubes and retaining them in positionuntilthey are permanently attached to the tubes; and it is one of thepurposes of this invention to so construct the fins that they willadhere to the tubes with sufiicient force to permit the tubes beingreadily handled without disturbing or dislocating the fins. Toaccomplish these desirable objects, I provide fins which are to acertain degree expansible and resilient, and construct these fins in amanner that will cause the fins to stick tightly to the tube, evenshould the tube be somewhat irregular in shape or size, until the finsare permanently attached to the tube by soldering.

In the drawings forming a part of this specification and illustratingthis invention quite fully Figure 1 is a side elevation of a water tubeprovided with my improved heat conducting fins. Fig. 2 is a sectionalplan of the same on line 2-2 of Fig. 1. F1g. 3 is a sectional plan viewof one of the fins, on line 3-3 of Fig. 2, the tube being omitted inthis figure. Fig. 4. is a side elevation of a fragment of a water tubeand one of the fins, illustrating a slight modification of the fin. Fig.5 is a side elevation of a pair of Water tubes provided with a series oftwinfins; and Fig. 6 is a plan of the same. Fig. 7 is an, end elevationof a pair of tubes'provided with a twin fin; and Fig. 8 is a plan of thesame. water tube provided with a circular fin constructed in accord withmy invention.

Like parts are designated by the same characters and symbols ofreference in all the figures.

A, in the drawings designates. the tube; and B, the heat conducting finsthereon.

Fig. 9 is a plan of a round This tube is of any desired design,preferably of elongate ovate transverse contour, having flat, parallelsides 12, and rounded ends 13. This tube may be a seamless drawn tube,or formed from strips of metal and lock seamed. In the latter case,which is probably the most prevalent method of producing these tubes onaccount of cheapness, they are not perfectly uniform, so that there isconsiderable difiiculty exper'ienced in making the fins stick to thetube until permanently attached thereto, owing to the fact that theopenings in the fins, which are punched therein by suitably constructeddies, are practically uniform in size, may fit some portions of the tuberather loosely and are, therefore, liable to shift out of their properposition.

The fins B, are made from thin sheet metal, and are likewise of elongateovate contour having parallel sides 14, and rounded ends 15. These finsare punched each with an oblong hole 16, corresponding approximately tothe outer contour of the tube A, the inner margins of the fin beingslightly beveled, as at 17 the object of which willhereinafter appear.These holes are slightly shorter than the width of the tube, and in theparallel sides of these fins there are formed corrugations 18, which aresufficiently pronounced to render these fins longitudinally expansiveand resilient, so that when the. fins are forced upon the tube, theywill slightly elongate and owing to their resiliency have a tendency tocontract and to stick so tightly to the tubes that the tubes can beeasily handled Without disturbing the position of the fins upon thetubes. And in order to permanently aifix these fins to the tubes, Iproceed, as follows:

I first place the tubes into a fluxingsolution, and then dipthe tubesinto a bath of flux, will flow into the minute grooves 19, formed at thejunction of the fins with the alongside of each other.

tubes by the slight beveling 17 of the inner margins of the fins, sothat when the solder has solidified, these fins are integrally connectedto the tubes, at the same timegiving to the whole a protective metalliccoating of solder, whereby I am enabled to make the tubes and fins of aferric metal if desired, which will cheapen the cost of the tubeswithout seriously afiecting the efficiency of the tubes and the heatconductors.

' In order to still further reduce the cost of manufacturing the watertubes, I make the fins in connected multiples; and in Fig. 5, I haveillustrated a pair of water tubes provided with twin fins, which aresuitable for, employment in radiator cores wherein rows of tubes areplaced fore-and-aft, or behind each other so as to correctly space thetubes; and in Figs. 7 and 8, I showtubes having twin fins which spacethe tubes positively The advantages derived by thus forming multiplefins are that their cost of production is no more than that of singlefins, and that the tubes are positively spaced apart and cannot bedisturbed in their position by the jars and jolts to which a radlatorwhen mounted upon a motor driven vehicle, is always subjected to.

In certain radiators wherein plain round tubes Aa, Fi .9, are preferredand surrounded by circu ar fins Bb, provide these fins with radiallyextending corrugations 20,

whereb these fins are rendered expansible and resllient in severaldirections and thereby enabled to hug the tube Aa snugly until they arepermanently secured thereto by my method of dipping as hereinbeforedescribed.-

In the construction hereinbefore set forth, the fins B are expansibleand resilient in the longitudinal direction only, which is, however,suflicient for all practical purposes; but when desired, these fins canbe made expansible and resilient in both, longitudinal v and transversedirections, by corrugating the ends of the fins as shown at 21, and thesides thereof as at 22, Fig. 8.

Attention is now invited to the slight flaring edges. of the innermargins of the, fins which form, when assembled upon the tube, smalldepressions 19; These flaring edges form, as it were, slightly enlargedentrants through which the tube may find its way into the fin, therebyslightly elongating the fins which owing to their resiliency will causethem to cling to the tube without any other assistance or means forholding them temporarily to the tube.

projecting laterally from said tube in spaced relationship, said finsbeing curved between their ends to make them expansible and said finsbeing resilient and adapted to be forced along the tube to theirpositions and to remain on the tube by the contractive force of thefins.

2. In a radiator for automobiles, a flattened tube in combination with athin sheet metal fin for placementon the tube, the fin having acentrally disposed elongated hole shorter than the width of the tube andthe fin being curved laterally between its ends whereby the said openingis adapted to be lengthened by flattening the fin as it is placed inposition on the tube and is adapted to automatically engage the tubewith a holding pressure when the flattening force is removed.

3. A radiating fin for a water tube for an automobile radiator the finbeing formed out of relatively thin sheet me al and provlded wlth acentral opening for receiving a tube, the fin being distorted out of itsplane in a transverse section crossing said opening whereby a dimensionof the openmg is made less than the similar dimension of the tube towhich it is to be applied, the hole being adapted to be elongated in itsshortened dimension by flattening the fin, and adapted to engage a tubewith a holdv,ing pressure when the flattening force is removed.

4. The improvements herein described, comprising a flattened water tubefor an automobile radiator, a fin made of relatively thin sheet metalfor placement on the tube, the fin provided with a central elongatedopening substantially fitting the tube, the fin curved to one side at apart extending transversely of said opening for shortening the opening,the opening adapted to be elongated to permit the fin to be readilyplaced in position on the tube by pressure tending to flatten the fin.

5. The improvements herein described comprising a relatively thin sheetmetal fin for a water tube of an automobile radiator, the fin having acentral opening of less dimensions than the tube at least in onedirection and having a relatively narrow flange defining the peripheryof the opening, the fin curved out of its plane at a point between itsends and transversely of said opening .whereby when a flattening forceis applied to the fin the opening is elongated permitting the fin to bereadily placed upon a tube, the fin being resilient and adapted toengage the tube with a holding pressure when the flattening force isremoved.

6. In a radiator core, water tubes, twin sheet metal fins connectingpairs of water tubes, each fin having two openings one for each tube,the two partsof the fin curved out of its plane whereby the openings arereduced on one diameter, the fins 10 adapted to be placed upon the tubesby lateral pressure which tends to elongate the openings and permit theready placement of the fins, the fins being resilient and adapted toengage the tubes with a holding pressure when the lateral pressure isremoved.

In testimony that I claim the foregoing as my invention, I have hereuntoset my hand.

OH'AiRIJES F. SPERY.

